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Business Segments and Geographic Information - Narrative (Details) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2019 USD ($) | Sep. 30, 2018 USD ($) | Sep. 30, 2019 USD ($) segment | Sep. 30, 2018 USD ($) | Dec. 31, 2018 USD ($)
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Number of reportable business segments | segment |  |  | 4 |  |
Equity in earnings of affiliates, net of income tax provision | $ 2,228 | $ 2,735 | $ 6,645 | $ 7,071 |
Investment in affiliate | 0 |  | $ 0 |  | $ 0
SACS |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Ownership percentage in entity |  |  | 50.00% |  |
Equity in earnings of affiliates, net of income tax provision | 1,200 | 2,200 | $ 3,800 | 5,900 |
Investment in joint venture | 10,900 |  | 10,900 |  | 13,400
Geo Amey |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Equity in earnings of affiliates, net of income tax provision | 1,000 | $ 600 | 2,800 | $ 1,200 |
Investment in affiliate | $ 7,300 |  | $ 7,300 |  | $ 4,800

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